DISEASE RELATIONS 



MAN ; Boutonneuse fever (Rickettsia conorii ) . 



The vinos of Rift Valley fever of man and animals survives 

 only until the tick molts and is transmissible only experimentally. 



CATTLE ; The common, important vector of East Coast fever 

 (Theileria parva ); experimental work with the "tvtming sickness" 

 form als~reported . Pseudo East Coast fever (T. mutans ). Red- 

 water (Babesia bigemina ) . Louping-ill (virus)" (experimental) . 

 Not a vector of bovine infectious petechial fever (Ondiri dis- 

 ease) (virus). 



SHEEP ; Nairobi sheep disease, and (experimentally) louping- 

 ill (both virus). 



GOATS ; Nairobi sheep disease (virus) . 



HCRSES ; Louping_ill (virus) (experimental). Not a vector 

 of horsesicknessj virus is not transmitted to the progeny of 

 ticks from fat ally- infected hosts. 



RMARKS 



Integumentary sense organs, which are fixed in n\imber and 

 location, and which are essentially similar in all stages of 

 the tick, though more primitive in larvae, have been described 

 and illustrated by Dinnik and Zumpt (194-9). 



A misformed specimen has been described and illustrated by 

 Nuttall (I9IA A ) (repeated by most subsequent workers on the sub- 

 ject) and a gynandromorph has been reported by Santos Dias (1952E) . 



Schulze*s work on the brown ear- tick has included certain 

 aspects of the larval gut (1943B), of the larval haller^s organ 

 (1941), and of the external body structvire of males (1932C). 



II 



Copulation has been observed by Donitz (1905) and discussed 

 by Christophers (1906); the same remarks as for R. e. evert si 

 (page 652) apply to the brown ear-tick. ~ ~ 



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